In Vitro Effects of Five Different Classes of Fungicides on Growth and Development of Botrytis cinerea Isolated from Tree Peony in China

Abstract

<jats:p>Gray mold caused by <jats:italic>Botrytis cinerea</jats:italic> has become an important limiting factor for tree peony production. Currently, chemical control is still the main means of managing the disease in China. The objective of this study was to test fungicides with different mechanisms of action in controlling <jats:italic>B. cinerea</jats:italic> on tree peony. The inhibitory efficacy of five fungicides on four asexual stages was measured in the petri dish containing culture medium amended with a tested fungicide at various concentrations. The results showed that carbendazim had the strongest inhibition effect against all four stages of <jats:italic>B. cinerea</jats:italic>, with the EC<jats:sub>50</jats:sub> values of 0.1037, 0.0563, 0.5578, and 0.0797 mg·L<jats:sup>–1</jats:sup>, respectively. The inhibitory effect of diethofencarb was only slightly less than that of carbendazim on conidia production, germination, and germ tube elongation. The inhibitory effect of procymidone was second only to that of carbendazim on colony expansion. The results indicated that carbendazim and diethofencarb could be used as protective fungicides to spray in the early stage of disease occurrence to inhibit conidia germination and germ tube elongation, so as to reduce the infection rate of <jats:italic>B. cinerea</jats:italic> and prevent disease occurrence. Carbendazim, procymidone, and diethofencarb mainly inhibit the reinfection of <jats:italic>B. cinerea</jats:italic> by inhibiting the growth of mycelium and the production of conidia, so they could be used as control fungicides during the occurrence phase of the disease.</jats:p>

Synthesis and Anti‐Oomycete Activity of 1‐Sulfonyloxy/Acyloxydihydroeugenol Derivatives

“…The reason is that the P. capsici has strong adaptability to fungicides and new hosts plants [1–6] . Fungicide is still an effective way to control P. capsici because the research on resistant germplasm resources lags behind the evolution of pathogens [5–9] . Like other members of this destructive genus, P. capsici has strong infectivity, a wide host and high resistance frequency [1–6] .…”

Discovery of Natural Product‐Based Fungicides (II): Semisynthesis and Biological Activity of Sarisan Attached 3‐Phenylisoxazolines as Antifungal Agents

“…Many phytopathogenic fungi, such as Botrytis cinerea , Colletotrichum lagenarium , Alternaria solani , Fusarium solani , and Fusarium graminearum infect crops, are hard to control and results in severe damages to crop yields [1–4] . Although many synthetic chemical fungicides play an important role in plant diseases control, repeated use of these agents has led to the increase of drug resistance and other detrimental effects on the environment and human beings [5,6] .…”